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Commitments and contingencies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Contingencies |  |
Employment Agreement Base Annual Salaries | $ 5.5 |
Cayman Water Retail Operations, Percentage Of Gross Profit | 53.00% | 54.00%
Cayman Water Retail Operations, Percentage Of Revenue | 39.00% | 39.00%
Long-term Purchase Commitment, Amount | $ 5.5 |
WSC [Member] |  |
Contingencies |  |
Accounts Receivable, Net | $ 18.4 | $ 17.6

X
- Definition Represents the percentage of consolidated gross profit from Cayman Water retail operations. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of consolidated revenue from Cayman Water retail operations. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition na + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the base annual salary amount, under the employment agreement. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |